Casings of metal for oilwells
压缩空气管用金属配件 Fittings of metal for compressed air ducts 油井金属套管 Casings of metal for oilwells 油井用金属套管 Oilwells (Casings of metal for –) ..
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油井金属套管 oil well metal casing
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短语
油井用金属套管
Oilwells
;
metal casing for oil wells